...Adopt the GSM network, no distance limit when alarming. 2.Can surpport the GSM cell phone, with sending the English message function. 3.Can store five alarm phone number and the room number message, which can...

...Tri-band GSM module(900/1800/1900Mhz) Easy DIY installation Thanks to the latest secure wireless technology, there are no cables to be installed, no lifting carpets and no redecorating required. ...

...China Factory Offer Wireless GSM Home Alarm System Skype: glare.wang W20 GSM Alarm System is a new security protection solution special for home, house and office and other applications. It based on Wireless GSM ...